Squeal go away!

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aidso
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Squeal go away!

Postby aidso » Fri Jul 12, 2013 16:13 pm

I have a newish pair of Ashima Semi-Metallic brakes pads (Deore) fitted and they will not stop squealing. Was out on the trail last night and it was embarrassing!
I've had them completely off; use Muc-Off Disc Brake Cleaner all over them and the rotors; scrubbed off with warm water; then got a small sand-paper block and sanded both rotor and pads.....and they are still squealing. Is there anything else than can be done?

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supersonic
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Re: Squeal go away!

Postby supersonic » Fri Jul 12, 2013 16:16 pm

make sure the split pin is fitted properly, and all the bolts are torqued corectly.

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aidso
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Re: Squeal go away!

Postby aidso » Fri Jul 12, 2013 16:37 pm

Yeah everything looks tight to me. No movement in those things

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cooldad
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Re: Squeal go away!

Postby cooldad » Fri Jul 12, 2013 17:01 pm

Ride. Brake, repeat.
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Martin19681968
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Re: Squeal go away!

Postby Martin19681968 » Fri Jul 12, 2013 20:57 pm

Don't know if this works with bikes,but on car brakes to stop squeal use a bit of copper grease on metal edge and back of the pads

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cooldad
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Re: Squeal go away!

Postby cooldad » Fri Jul 12, 2013 22:20 pm

I would suggest not getting any grease anywhere near the pads. Car and bike systems are different.
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Gibbo3771
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Re: Squeal go away!

Postby Gibbo3771 » Fri Jul 12, 2013 23:17 pm

Take the pads out and hover them over a gas hob, let them soke, dip in water.

Then rebed them in.

I would also consider just cleaning your rotors with extremely hot water, NO SOAP.A damn good clean, a good 5 minute scrub each with boiling water.

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Schmako
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Re: Squeal go away!

Postby Schmako » Sat Jul 13, 2013 09:59 am

Trailside repair for squealing brakes is get some muddy/gritty dirty water and rub over the pads.

It does work usually.

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Thelonegroover
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Re: Squeal go away!

Postby Thelonegroover » Mon Jul 15, 2013 10:21 am

Metalic or semi-metalic pads do tend to squeal. Cleaning rotor and pad may help for a while but the squeal may well return. You could try and place some copper grease on the back of the pad but you could end up getting grease on the braking surface.

The only other alternative, is to try different pads.
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YeehaaMcgee
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Re: Squeal go away!

Postby YeehaaMcgee » Mon Jul 15, 2013 11:50 am

Pads may be contaminated, and despite there being literally 3.74 million ways to clean them documented on t'internet, I've found that none of them really work.

Clean the disc with Isopropyl alcohol, and get new pads. Nothing else, just IPO. I've seen brake cleaners annihilate brake pads - even ones supposedly intended specifically for MTB disc brakes.

Mccraque
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Re: Squeal go away!

Postby Mccraque » Wed Jul 17, 2013 08:36 am

have you tried re-centering the caliper?

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aidso
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Re: Squeal go away!

Postby aidso » Fri Jul 19, 2013 19:30 pm

So I've tried everything and I think finally I am seeing some results - hopefully not speaking too soon :).
Scrubbed the rotors to death and then some of the pads. Stuck the pads in the oven for 45 minutes then put everything back together with some copper grease on the back of the pads and so far we've no squeak and a little bit of braking. Hopefully in the morning I can get it a bit further along the trail and get her locking up :).

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cooldad
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Re: Squeal go away!

Postby cooldad » Fri Jul 19, 2013 20:19 pm

Apart from all the random weird things you've done like cooking pads, grease and brakes is a rather stupid combination.
Good luck.
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MrM
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Re: Squeal go away!

Postby MrM » Sat Jul 20, 2013 00:10 am

Remove pads, spray with meths, ignite. Once cooled down re-fit pads

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The Rookie
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Re: Squeal go away!

Postby The Rookie » Sat Jul 20, 2013 04:19 am

Which will do nothing for any contaminant soaked into the porous pad.....

Squealing is rarely caused by contamination anyway, it's something hitting it's resonant frequancy, Avid are 'worse' (more likely to do it) as the silly CPS washers make the mounting less stiff, lightweight discs are 'worse' as they are less stiff and sintered pads are 'worse' as they are stiffer than organic/kevlar and thus don't damp the disc as much. Had all three on the back of mine, always squealed, even after new pads and cleaned discs, then I fitted a Shimano rear brake with an IS caliper (much stiffer mounting) and no more squeal.

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allthegearnoidea
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Re: Squeal go away!

Postby allthegearnoidea » Sat Jul 20, 2013 10:13 am

YeehaaMcgee wrote:
Clean the disc with Isopropyl alcohol, and get new pads. Nothing else, just IPO. I've seen brake cleaners annihilate brake pads - even ones supposedly intended specifically for MTB disc brakes.


This!! very much this!! the muck off disc cleaner wot stop the squealing, if anything make it worse! IPA is the only way to go IMO, remove any traces of the copper grease you've put on, lightly rub the disc with some sand paper, ipa wipe down, lightly rub the surface of the disc pad too, remove any Shinyness, ipa wipe them, put it back together, rebed in and ride, Dont spray anything near the discs, or close to the discs! A short dab of the top of the spray nozzle can see the spray floating Meters away from the start point, Resist sprays on bike!!

Ipa for all braking surfaces, its cheap too, my last lot was £6/L from the local fiberglass suppliers,

Sintered pads do tend to squeal more than others too, ive changed back to std pads after years of sintereds, they are great for long downward rides, but short gentle use tends to shiny them up and thus squeal/howl like mad and mush less braking!
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Larok
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Re: Squeal go away!

Postby Larok » Sat Jul 20, 2013 21:01 pm

spray the pads with brake disc cleaner and leave it on.


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